Grill brush



FIG. 1 is a front perspective view of the disclosed grill brush; and,

FIG. 2 is a side perspective view of the disclosed grill brush.

The grill brush is characterized by the shape of the grill brush.

The broken lines showing the head illustrate portions of the grill brush that form no part of the claimed design. 

The ornamental design for a grill brush, as shown and described. 